Floating crane.



simultaneously usethese balancing countern beam loi' jib c, the latter swinging in a veraman 'STATES PATENT oEEioE.

. lLfiLEEEDEohELANDKAEL BTTCEEE, or EENEATH, NEAR iiiissELnoEF,` GERMANY,

ELOATING CRANE.

To all `whom it may concern:

Be it known that we, ALFRED Bonn and use ful Improvements in Floating Cranes, of y which the following is an exact specification.

In craneswith beams movable in a vertical plane `it `is well known to connect ythe `beams with `a `weight in such a manner that the weight :tends to pull the beam up, whereby the winding iip device is relievedto a certain i. cranes, ini` which, as is well known, counter weights are used to partially Vbalance the` C ing axis `of thebeam. The screw-spindle is extent. i l

The present invention relates to floating tilting forces that come in action on one side in icranes used onpontoons. y

The object of the present invention is to weightson 'floating cranes withrjibs or beams to rrelieve `the winding-up device, which serves for pulling up the beam on t-he floating cranes. i

In the accompanying drawing one embodiment of the invention is illustrated.`

`Upon :a pontoon a the `rotatory crane is shown, iin which the rotary column structure Z9 carries a lifting member in the form of a tical direction. Theidr'awing-up of the beam c\is:effectedbymeans of the screw-spindle al which passes through a swinging screw-nut c mounted at the edge opposite to the turnr-otated by meansvofa pair of bevel-wheels g` 711thewheelsgrbeing arranged at the lower end of the screw spindle cl and the wheel it on the upper rear edge of the column b.

z' is a-'gear wheel rigidly connected with the bevel 7L. rThe bevel wheel c' is operated by means ofthe bevel wheels 7c m, `and `the shaft `mwhich is driven `by a suitable `motor (not shown).` Accordin to the turning direction of the shaft t e beam is either drawn-upor lowered. The counter-weight e 'issuspendedon the rear side of the column Zi 'in such a manner, that the carrying rope, one end lof which is attached to the upper rear .edge 4of the beam, passes Vover a V guide roller c?. In thelembodiment shown inthe Specification of Letters Patent.

i Application filed February 1,8, 1907. Serial No. 358,033.

Patented July 13, 1909.

drawing the rope is conducted over another roller f, secured to the weight andthe other end of `the rope is attached to the column structurel at b2. This pulley-block like arrangementmay of course be departed from and the weight may if desired be directly secured to the beam. In such case the weight cannot `have such, a low position as is the ease when the pulley-block connection is employed. l l

During the drawing-.up or derricking niotioii of the j ib the momentum resulting from the combined actions of the jib load and balance weight will `on one side of the center of rotation decrease to zero and, if the .drawing upv is continued,increase again on the other side. In the latter case the shaft d will be subj ect to pressure. This is in most cases idisadvantageous and in order to limit l this action of the balance weight as much as required, we provide, on the lower part of the column Z), a support g which receives the balance-weight e at a suitable moment and stops its action. e

Instead of arranging `the upper part of the crane so as to be rotatable ina horizontal plane as is shown in the drawing, such rotation may be dispensed with, the upper part of the crane being rigidly connected with the floating pontoon.

Having now particularlyV described and ascertained the :nature `of our said invention,` and in what manner the saine is "to be performed, we declare that whatwe claim is:

l.` The combination with a pontoon and a crane carried thereby having a vertically movable lifting jib, of means acting as bal#` last for saidjib to maintain the stability of the pontoon, and operative also-to tend to raise the said jib.

2. The combination with a pontoon .and a crane carried thereby having a `vertically movable lifting jib, of a weight having con a ,rotatable crane carried thereby having a vertically movable lifting gib, of means rotating with said crane acting as bal-last for` 'Ihe combination with a pontoon vand i said jib to maintain the stability of the pontoken, and operative also to tend to raise said J1 el. The combination with a pontoon and a crane carried thereby having a vertically movable lifting jib, of means acting as ballast for said jib to maintain the stability of the pontoon, and operative also to tend to raise the said jib, and means adapted to arrest the action of said means tending to raise the jib.

5. The combination with a pontoon and a crane carried thereby having a vertically movable lifting j ib, of means acting continuously as ballast for said j ib to maintain the stability of the pontoon, and operative temporarily only to tend to raise said jib.

6. In combination with a pontoon and a rotatable crane carried thereby having a vertically movable lifting jib, of means rotating With said crane and acting continuously as ballast for said jib to maintain the stability of the pontoon, and operative temporarily only to tend to raise said jib.

7. The combination With a pontoon and a crane carried thereby having a vertically movable lifting j ib, of means acting continuously as ballast for the said jib to maintain the stability of the pontoon, and operative to tend to lift the jib during a portion only of the vertical movement of said jib.

8. The combination With a pontoon and a crane carried thereby having a vertically movable lifting ib, of means acting continuously as ballast for said jib to maintain the stability of the pontoon, and operative to tend to raise said jib only to a point of the vertical movement of the said j ib beyond the point at which the combined moment of jib and ballast acts upon the ballast side of t-he axis of rotation of said jib.

9. The combination with a pontoon and a crane carried thereby having a vertically movable lifting jib and means adapted to move said jib, of means acting as ballast for said jib to maintain the stability of the pontolpn, and operative also to tend to raise said 31 10. The combination With a pontoon and a crane carried thereby having a vertically movable lifting jib and a rotatable spindle adapted to move said jib, of means acting as ballast for said jib to maintain the stability of the pontoon, and operative also to tend to raise said jib.

11. The combination with a pontoon and a rotatable crane carried thereby having a vertically movable lifting jib and a rotatable spindle adapted to move said jib, of means rotating With the said crane acting as ballast for said jib to maintain the stability of the pontoon, and operative also to tend to raise the said jib. v

12. The combination With a pontoon and a crane carried thereby having a vertically movable lifting jib and a rotatable spindle adapted to move said jib, of means acting continuously as ballast for said jib to maintain the stability of the pontoon, and operative temporarily only to tend to raise said 'ib. J 13. The combination with a pontoon and a crane carried thereby having a vertically movable lifting jib and a rotatable spindle adapted to move said jib, of a Weight having connection With said jib and so located With respect thereto as to act as ballast for same to maintain the stability of the pontoon, and to be operative also to tend to raise said jib, and means adapted to arrest the actionA of said' Weight tending to raise said jib.

14C. The combination with a pontoon and a crane carried thereby having a vertically movable lifting jib and a rotatable spindle adapted to move said jib, of means acting continuously as ballast for said jib to maintain the stabilityof the pontoon, and operative only to tend to raise said jib to a point of the vertical movement of said jib at which the combined moment of the jib and the ballast causes undue compression on" said spindle.

15. The combination With a pontoon and a crane carried thereby comprising a supporting structure, a vertically movable lifting jib carried thereby, and means adapted to movesaid jib, of means actin as ballast for said jib to maintain the stabllity of the pontoon, and operative also to tend to raise said jib.

16. The combination With a pontoon and a crane carried thereby comprising a rotatable supporting structure, a vertically movable jib carried thereby, and means adapted to move said jib, of means rotating With said crane and acting as ballast for said jib to maintain the stability of the pontoon, and operative also to tend to raise said jib.

17. The combination with a pontoon and a crane carried thereby comprising a supporting` structure, a vertically movable lifting j ib carried thereby,'and a rotatable spindle adapted to move said jib, of a Weight having connection With said jib and solocated .With respect thereto as to act as ballast for said jib to maintain the stability of the pontoon, and to be operative also to tend to raise said jib, and means adapted to arrest the action of said Weight tending to raise said jib.

18. The combination With a pontoon and a crane carried thereby comprising a supporting structure, a vertically movable lifting jib carried thereby, and a rotatable spindle adapted to move said jib, of a Weight having connection with said jib and so lo;

cated with respect thereto as to act as ballast The foregoing specification signed at Dusfor the jib to maintain the Stability of the Seldorf Germany this seventh day of Febl0 pontoon, and to be operative also to tend to ruary, 1907.

raise the said jib, and means adapted to ALFREDBODE. arrest the action of said Weight at a point KARL BOTTCHER.

i of the Vertical movement of sald jib at which In presence of two Witnessesthe `combined momentof the jib jand ballast ALFRED POHLMEYER, causes undue compresslon on sald spindle. ERNEST BORDRE. 

